Overload safety apparatus.



No. 829,371. PATENTED AUG, 21, 1906.

P. J. DARLINGTON.

OVERLOAD SAFETY APPARATUS.

APPLICATION FILED APR.Z6.1904.

INI ZIVTOR.

L 4/ T N ESSAY; 1. 4 4 0 /9# 'roN, a citizen of the United States of America,'

PHILIP J. DARLINGTOKOF GLENRIDGE,

srR o'oE ELECTRIC NEW JERS Y, ASSIGNOR TO- coM-rANY, A ,ooEroRAnoN on NEW ns n I OVERLOAD SAFETY A PARXI'UsQ To all whom it may concern:

Be it;known that I, PHILIP J. DARLING- and a resident of, the town of Glenridge, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Overload Safety Ap aratus, the principles of which are set fort-l in the following s ecification and accompanying drawings, which disclose the form of the invention which I now consider to be the best of the various forms in which the principles of the invention ma be embodied.

The invention relhtes to improvements in overload safety a paratus;

In various kin s of-machinery 0 power certainconditions, such as -t e character of the motor, are such that it is possible for the motor to lift a load of such weight that serious injury may result to some part of the apparatus or motor. This is the case erated by 1n anordmary electrically-operated hoisting apparatus, wherethe electric motor may'lift designedand intended to. lift.

mounted and keyed on the power-or motor shaft 1, and the 5 are mounted a load severaltimes as heavy as the maxi mum load which the hoisting ap aratus was e lift' of a load hoistor to its supports, to the motor, or even 'to the load itself. A

Theobject 0. this invention is to provide power machinery with overload safety appal ratus ofa compact and efficient type adapted for the p ose of preventing the occurrence of the resu ts above referi ed to.

Of the drawings, Figurli l a plan view of embodying the invention. Fig

Fig. 1 the power-shaft 1 drives the hoisting-drum shaft-7 by means of the geartrain 2, 3, 5, and 6. The; gear or pinion 2 is gear 6 is-mounted and keyed on the shaft.7, which shaft carries the hoisting-drum. 13. The shaft is arranged in alinemeot with the shaft 1. "The gears 3 and and keyed on the countershaft 4. The ends of this countnshaft 4 are journaled in the two sides of the movable member or U-shaped framelO. -The separated ends of theframe 10 (shown at the l right) are constructed and arranged to serve Specification or Letters Pater-it. Application and April as, 1904. Serial m). 2%,961.

"Wardly at t part 15 and atits np'prana to'a movable member '10 .il1'lhe -s exceeding such maximum safe loa extremely liable to result in damage to the .to theload X,

I p 21s anelevationof the same, sho w in electric power connections.

The particular Patented Aug'-.=21, 1906 as j oumals for the opposing ends of the shafts 1 and 7. The U-shaped end of the framellO is movable about the common, axis of the shaftsl and 7 as a center.-

Assum by a suit a lileconnection .14 to the hoist drum 13, as shown, andready tobe lifl d the rotation of the powenshaft 1 in an antithat a load X s. 2, is attached clockwise direction is necessary to lift; the i load. The eflort requiredQto the load X,

acting throufih-thegear'2, will operate downe 1 point ofengagement s of the gears 2 and 3. sea fulcrum to exert an up,- ward pressure at the axis of theear 3 and tend to move the center.

arranged in any smitablemanoenso that it remain stationaryin resistance tetheeffort required to loadspf suchweight' as will. not be' likely; to injure the apparatus. For exam le, ass connecte at its lowerfiend $0, a; stationary 1' equivalent is soflcoostructed t at it "will nut the member 10 to move upwardly,

flamelllupwar yina,circle-about the axis of the shafts '1 and lies a 1 g F" The movable member 10' is. constructed 6 "and P 1: th 1 onlyin case thewelghtibf the loadXiexceeds l a predetermined :safe 'flimit; Nor ally left'hand e11d, f the. member 1Q will thestop 20, 2 The member 1 1O ranged in'an suitable inovement wi lstop th h pplication oi p owen t us prevent' injury to any; part of the apparatus, incliihdh 'ng 'the motor.

itself. This stopping of the; application }of power Y by 'the movement of the .member 10,

may be accomplished in a variety of ways,

method disclosed vherein consists 1n causing the movement of thefmemher 10'to stop the operationofthe motor itself as distinguished from, causing the movement'of the member 10; to disconnect the motor from the load, as by :moving the gear 3 out of mesh with the crating any suitable disconnectingbetween the v p g amdple, as shown Fig. 2, the power-shaft 1 is r the w Q motorsand the load.- reath iven' by an electric motor onetary-e.

be of such character. as

to have .sufiicient ho power to lift a load having a weight several is constructed- I manner so that: its

gear 2 or bylgo ror times that of the maximum load which the apparatus isdesigned tolift. lhc operation of this electric motor U .is controlled by the switch 12, which is provided with a suitable fixed contact. The pivoted member 18 of the switch 12 is operatively connected with the movable member 10b a rod 11, so that the upward movement of the member 10 will open the switch 12 and stop the operation -of the motor M. A movement of the member 10 beyond that which is required to open the switch 12 is prevented by the stop 9. The motor M is supplied with current from a suitable electric generator G, controlled by a suitable starting-switch S, which switch may be operated at will independently oi the switch 12. If desired, the switch 12 may be a rheostatic or starting switch and the switch S merely a circuitopener. As shown, one of the leads from the generator G is connected with the fixed contact of the switch 12 and the movable switchblade 18 is connectedwith the motor-lead 17.

If the load has hotbeen lifted before the switch 12 is opened, the member 10 will move downwardly as soon as the motor M is stopped. It the load has been slightly lifted before the switch 12 is opened, the

member 10 will remain in its raised position as long as there is sufficlent upward pressure of the teeth of the ear 6 against the teeth of the gear to hold t e member in its raised position. I As soon as the effect of the ex cessivo load is removed the member 10 will descend to its normal position on the stop 2-0 to close the switch 12.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. -[n an electrically-operated hoisting apparatus, the combination with an electric motor, of a power-shaft driven thereby, a member pivoted concentric with said shaft, a counter-shaft carried by said pivoted mem ber, intermeshing gears on said power-shaft and counter-shaft, a hoistingalrum shaft constructed and arran ed to be (lIlVGIlfrom said counter-shaft, an means controlled by the movement of said pivoted member, to

stop the application of the tor to the load.

2. In a hoisting apparatus, the combination with a motor, of a gear-train for transmitting power from the motor to the load to be lifted, means for stopping the application of the ower of the motor to the load, and a movablb member carrying at least one of the ears of said train, said movable mem her be mg constructed and arranged to operate said power of the mo stopping means by its movement due to a predetermined effort of the motor.

3. In a hoisting apparatus, the combination with a motor, of a gear-train for transmitting power from the motor to the load to be lifted, means .for controlling the avplica- Lion of'the power of the motor to the load, a

pivoted member operatively connected to l said controllingmeans and carrying at' lejast from the power-shaft, a hoisting-drum shaft constructed and arranged to be driven from said counter-shait-, and means operated by the movement of said pivoted member to control the ap lication of power to the load.

5. In a oisting apparatus, the combination with a power-shaft, of a member in which said shaft is journaled, which member is movable about the axis of said shaft as a center, a counter-shaft mounted in said member and constructed and arranged to be drivenby said power-shaft, a hoisting-drum shaft con. structedand arranged to be driven. from said counter-shaft, and means constructed and arranged to be operated by the movement of said member on its center, to control the application of power to the load.

6. In a hoisting ap aratus, the combination with a power-shalt, of a member pivoted concentrically therewith, a counter-shaft mounted in said member and constructed and arranged to be driven from said powershaft, a hoistin -drum shaft constructed and arranged to be riven from said counter-shaft at a speed lower than that of the power-shaft, and means operated by the movement of said pivoted member, to control the application of power to the load.

7. In a hoisting ap aratus, the combination with a power-shait, of a member pivoted concentrically therewih,'-a counter-shaft mounted in said member, intermeshing gears on said cover-shaft and counter-shaft, a hoist ngrum shaft, a second gear on the counter-shaft which is ofsiii-aller diameter than the first gear on the counter-shaft, a gear on the hoisting-drum shaft meshing with said second gear on the counter-shaft, and means operated by the movement of said pivoted member, and constructed and arranged to control the application of power to the load.

- 8. In a hoisting apparatus, the combination with a power-shaft, of a member pivoted concentrically therewith, a counter-shaft -mounted insaid member and constructed and arranged to be driven from said powersbaft, a hoisting-drum shaft in alinement with said power-shaft and constructed and arranged to be driven from said countershaft, and means operated by the movement; of said pivoted member to control the application of power to the load.

9. The combination with a power-shaft, of

and.constructed and arranged to be drivenby the efl'ort of the motor required to lift a p ICC 5i counter-shaft armn ed to'be driven there- In witn ss whereof I have hereunto set my fromfi afmovfgbliai 1111:5115 er carryng sgiddoum hand this 22d day of April, 1904.. v ter-samatirsatarrane to' riven T fromthe countefishaft andl eans constructv DARLH (ITON' 5 ed and arranged to be operat ed by the move Wifinessesz' ment of said movable member, to control th PAUL MULLER, operatiorrofithe third shaft. ROGER I-I. BUTTERWORTH. 1 

